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ALBERT G. SAFFORD, 0F BOSTON, MASSACHUSETTS.

Letters Patent No. 95,938, :lated October 19, `1869.

RAILROAD-'CAR VENTILATOR.

The Schedulereferred to m these Letters Patent and making part of thesame.

To all persons to whom these presents may come:

Be' it known that I, ALBERT G. SAFFonD, of Boston, of the county ofSuliolk, and State of Massachnsetts, have invented an ImprovedVentilator for Railway-Oarriages, or for apartinentsof various kinds;

and I do hereby declare the saine to be fully described in the followingspecication, and represented sin the accompanying drawings, of which-Figure l is a front elevation of the ventilator as closed.

Figure 2, an elevation of it as open. Figure 3, a transverse section ofit as open, the section being taken so as to exhibit the stops of thevalve ofthe ventilator.-

In the drawings- A denotes an elliptical valve, arranged within anelliptical opening, B, of like Isize', and pivoted at its opposite ends,and in the line of its greater axis, to the opposite ends of the saidopening, the pivots being represented in dotted lines at a a.

Near one of the pivots is a stop-piece, O, which projects from o ne endof the opening, and is formed in manner as represented in the drawings,its two edges, b c, which make a right angle with each other,

serving as stops, to arrest the valve in either a horizontal or avertical position, or opened or closed, as the case may be.

'At a short distance from the centre of the valve, a round ball or heavyweight, D, is fastened to the valve, and is project-ed therefrom, inmannerv as Tepresented. rlhis ball or weight, operating with the stops,serves to maintain the valve either opened or closed, or, in otherwords, either in a horizontal or in a vertical position.

The gravitating ventilator so made is not only sim- A

